installation - 10.10 still wont load 12.04

I have an old version of Ubuntu: 10.10. My other computer died so I got an Acer Aspire One D270-1865. I deleted as much of the Microsoft crap as possible. I changed the boot up to CD-ROM with F2 and F12. It will boot, then ask for login name then password. I give the corrrect ones then it says changes are avaliable etc and has my name again except after it there appears: AOD 270:~$ Then I'm supposed to put something there. I don't know what. I tried password, login name, etc. Nothing works. It then goes back to version 10.10. I've already down loaded the 12.04 several times thinking that it might be the problem. But still the same 10.10. What do I do?